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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
• 主管单位：中国科学院
• 主办单位：中国科学院寒区旱区
•                  环境与工程研究所
•                  中国地理学会

• 寒旱区水文与水资源 •

### 季风区长沙站大气水汽和降水中δ18O的模拟

1. 1. 湖南师范大学 资源与环境科学学院, 湖南 长沙 410081;
2. School of the Environment, Flinders University, Adelaide 5001, Australia
• 收稿日期:2014-07-09 修回日期:2014-11-25 出版日期:2015-02-25 发布日期:2015-03-23
• 作者简介:章新平(1956-),男,湖南长沙人,教授,1993年在中国科学院兰州冰川冻土研究所获博士学位,现主要从事气候变化的研究.E-mail:zxp@hunnu.edu.cn.
• 基金资助:

国家自然科学基金项目(41171035; 41271095); 湖南省重点学科建设项目(2011001); 湖南省"百人计划"项目(2010004)资助

### Simulation of δ18O in atmospheric vapour and precipitation in Changsha Station, East Asian monsoon regions

ZHANG Xinping1, GUAN Huade1,2, ZHANG Xinzhu1, WU Huawu1, LI Guang1, HUANG Yimin1

1. 1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China;
2. School of the Environment, Flinders University, Adelaide 5001, Australia
• Received:2014-07-09 Revised:2014-11-25 Online:2015-02-25 Published:2015-03-23

Abstract:

Using the isotope enabled atmospheric water balance model (iAWBM), the temporal variations of δ18O in atmospheric vapor and in precipitation are simulated and compared with actual observed data at Changsha station located in East Asian monsoon regions, in order to examine the capability of iAWBM simulating the water isotope cycle in atmosphere in monsoon regions, to deal with the main causes of isotope effects and to improve the understanding of isotope effects in the water cycle in monsoon regions. The simulated results reproduce well the observed seasonal variations of δ18O in precipitation. The basic characteristics that the stable isotopes in precipitation are depleted during the rainy season and enriched during the drought season, and the observed amount effect are well simulated under daily time scale. The simulated weighted average -6.58‰, of δ18O in precipitation during prevailing winter monsoon, is almost the same as actual one in the same period, but the value -9.58‰ during prevailing summer monsoon is lower than the actual one in the same period, from January, 2010 to December, 2012. As the designed, four forcing variables, atmospheric precipitable water, vapor flux, evaporation and precipitation, are combined into iAWBM for simulating the stable water isotope cycle. Of these four variables, the impact of precipitable water on the variation of stable water isotopes is embodied in the other three variables. Vapor flux has dual roles of enriching and depleting stable isotopes in vapor. Evaporation and precipitation have the role of enriching and depleting stable isotopes in vapor, respectively. For two variables that have the enriching impact on stable isotopes in vapor, the average isotopic contribution amount from vapor flux is 1.66‰ with the average contribution rate of 63.97%, and that from evaporation is 0.91‰ with the average contribution rate of 36.03%, showing that the isotopic contribution of vapor flux plays a major role. For two variables that have the depleting impact on stable isotopes in vapor, the average isotopic contribution amount from vapor flux is -1.40‰ with the average contribution rate of 53.47%, and that from precipitation is -1.09‰ with the average contribution rate of 46.53%, showing that the isotopic contribution of vapor flux is comparable to that of precipitation.

• P426.61+2